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How do I filter a datatable according to certain criteria for a column?

Posted on 2006-07-06
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Last Modified: 2011-09-20
This is what I want. However, I could not understand what was going on...

http://www.experts-exchange.com/Programming/Programming_Languages/C_Sharp/Q_20966959.html?query=filter+datatable&topics=327

I have a DataTable. It has many columns and rows. I wish to sort out only those rows that meet a certain criteria.

In this case, this datatable contains, for simplicity, just two columns

MailItem_ID      MailItem_Direction
1      Incoming Mail                
2      Incoming Mail                
10      Outgoing Mail                
11      Outgoing Mail                

I wish to, somehow, filter out "Outgoing Mail" and keep "Incoming Mail".

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Question by:M3hcSS
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5 Comments
 
LVL 25

Expert Comment

by:dstanley9
ID: 17053834
You can do it two ways:

1) Use the DataTable.Select() methos to get an array of DataRows back:

DataRow[] rows = table.Select("MailItem_Direction = 'Incoming Mail'");

2) Create a DataView to get a filtered view of the table

DataView view = new DataView(table);
view.RowFilter = "MailItem_Direction = 'Incoming Mail'";
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Author Comment

by:M3hcSS
ID: 17054151
Let me try the second way.

How do I rebind a datagrid to the dataview?

Right now I have the datagrid bound to the datatable.

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LVL 25

Accepted Solution

by:
dstanley9 earned 1400 total points
ID: 17054180
The same way:

DataView view = new DataView(table);
view.RowFilter = "MailItem_Direction = 'Incoming Mail'";
DataGrid1.DataSource = view;
DataGrid1.DataBind();

You can also apply the filter to the table directly:

table.DefaultView.RowFilter = "MailItem_Direction = 'Incoming Mail'";
DataGrid1.DataSource = table;
DataGrid1.DataBind();
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LVL 7

Expert Comment

by:jj819430
ID: 17054182
DataGrid DG = new DataGrid();
DG.DataSource = myDataView;
DB.DataBind();

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LVL 2

Author Comment

by:M3hcSS
ID: 17054189
                 DataView myDataViewTEST=new DataView(myDataSetMail.Tables["tbl_MailItem"]);
                  myDataViewTEST.RowFilter="MailItem_Direction = 'Incoming Mail'";
                  dgTEST.DataSource=myDataViewTEST;
                  dgTEST.DataBind();
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